Lathe-dog.



PATENTED DEC. 1, 1903.

A. TINDEL.

LATHE DOG.

APPLICATION FILED NOV. 13. 1902.

3 SHEETS-SHEET 1 H0 MODEL.

Fl L

A. TINDEL.

4 LATHE DOG.

APPLIUATION FILED NOV. 13.1902.

NO MODEL.

PATENTED DEC. 1, 1903.

3 SHEETS-SHEET 2.

5f%@r=rw@ PATENTBD DEC. 1, 1903.

A. TINDEL.

LATHE DOG.

APPLICATION FILED NOV. 13. 1902.

3 SHBETS-SHBBT 3.

N0 MODEL.

UNITED STATES Fatented December 1, 190 3.

PATENT ()rrrce.

ADAM TINDEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO TINDEL- MORRIS COMPANY, OF EDDYSTONE,- PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 745,977, dated December 1, 1903.

Application filed November 13, 1902. Serial No. 131.216. (No model.)

To a-ZZ whom it puny concern:

Be it known that I, ADAM TINDEL, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Lathe-Dogs, of which the following is a specification.

The object of my invention is to provide the face-plate of alathe with a dog, whereby a shaft or other object which is to be turned :0 can be firmly secured to said face-plate and caused to rotate therewith. This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which Figure l is a front view of part of the faceplate of a lathe provided with a clamping-dog constructed in accordance with my invention. Fig. 2 is a sectional view on the line a a,

1. Fig. 3 is a vertical section illustrat- 2o ing the application of my improved lathe-dog to a face-plate having an adjustable and rotatable supplementary face-plate thereon. Fig. l is a front view of part of the structure shown in Fig. 5; and Fig. 5 is a sectional view on the line b b, Fig. 4.

Referring first to Figs. 1 and 2 of the drawings, 1 represents part of the face-plate of a lathe having a projecting center pin 2 and provided with a series of undercut radial 5o grooves 3. To one of these grooves is adapted the headed portion of a bolt 4: and which projects beyond the face-plate and serves as a pivot-bolt for a pair of swinging jaws 5, whose free ends are adapted to clamp and 3 5 hold a shaft or other object which it is desired to secure to the face-plate, the jaws being maintained at the proper distance from the face-plate by means of an interposed nut (3, which is adapted to a-threaded portion of the bolt and serves to secure the same rigidly to the face-plate. A spring 7, interposed between the jaws 5 and adapted to a socket in each jaw, serves to normally separate the jaws, which can, however, be drawn together by means of a bolt 8, hung to a pivot-pin 9, which extends transversely across a slot 10 in one of the jaws, said bolt passing through a slot 11 in the other jaw and being provided with a nut 12, which bears upon awasher 13,

5o concaved to it a convex face 14: on the jaw,

so that swinging movement of the bolt 8 will be permitted without affecting the bearingsurface of the washer 13 upon. the jaw. The outer end of the bolt 4 is provided with a nut 15 and washer 16, and when the jaws have been tightened upon the shaft or other object by manipulation of the nut 12 said jaws can then be firmly clamped to the face-plate by tightening the nut 15.

In that embodiment of my invention shown in Figs. 3, 4, and 5 the face-plate 1 has undercut transverse guidegrooves 17 for the reception of headed bolts 18, which are provided with nuts 19 and serve to secure to the face-plate a cross-head 20. This cross-head can be adjusted laterally across the face-plate by any suitable meansas, for instance, by means of a screw adapted to a nut 21, projecting rearwardly from the cross-head between transverse guide-flanges 22, which are adapted to a central transverse slot 23 in the face-plate, as shown in Fig. 3. Mounted upon the cross-head 20 is a supplementary face-plate 24:, which has a projecting center pin 25, and is provided with headed bolts 26, furnished with nuts 27, and adapted to an undercut circular slot 28, formed in the cross head 20. From one side of the supplementary face-plate 24 projects a boss 29, which carries the bolt 4, upon which the jaws 5 of the dog are pivoted, these jaws being operated in the same manner as those of the dog shown in Fig. 1 and the bolt 4 being secured to the boss 29 in the same manner that the bolt 4 is secured to the face plate 1 in the device shown in Fig. 1. By reason of this construction the supplementary face-plate 24 can be moved laterally back and forth across the main faceplate, and the dog can be adjusted to any desired angular relation in respect to the work mounted upon the center pin 25, a device of this character being therefore especially available for use in lathes for turning crank-pins, eccentrics, and the like.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. The combination of the face-plate of a lathe, with a pair of jaws hung upon a bolt projecting from said face-plate, one of said jaws having a bolt pivoted thereto, which bolt passes through a slot in the other jaw at a point between the supporting-bolt and the point of contact of the jaws with a piece of work, said pivoted bolt being provided with a nut for pressing the jaws toward each other, substantially as described.

2. The combination of the faceplate of a lathe, with a pair of jaws hung therefrom, a bolt projecting from said plate, said jaws having means for drawing them together and means constantly acting to force them apart, the bolt connecting said jaws with the faceplate having a nut and a portion for the re ception of the same whereby it is held to the face -plate independently of the jaws, said bolt also having a second portion for the reception of the jaws of smaller diameter than that of the first portion, with means for retaining the jaws in position, substantially as 20 ADAM TINDEL. itnesses:

F. E. BECHTOLD,

ELIAS H. XVHITE. 

